Telegraph receiver



July 24, 1934. M. AMANN l-:T AL

TELEGRAPH` RECEIVER Filed Deo. 7, 1935 5 Sheets-Sheet l W d MUNHWW @www ,WHW

July 24, 1934. M. AMANN ET AL, 1,967,216

' TELEGRAPH RECEIVER Filed Deo. 7, 1935 l 5 'sheets-sheet 2 im.. if 415 P ",.M'giumgL 419 July 24, 1934. M AMANN ET AL 1,967,216

TELEGRAPH RECEIVER Filed Dec '7, 1933 5 Sheets-Sheet 5 Patented July 24, 1934 1.967,216 TELEGRAPH RECEIVER Max Amann and Alfred LahL'Frankrort-on-the- Main, Germany Application December 7, 1933, Serial No. 701,372 l In Germany November 30, 1932 19 Claims. (Cl. 178-34) This invention is concerned with the problem which occurs, for example, in telegraph receivers of. selecting one out of a number of type characters by means of signal code current impulses of the Baudet type either for printing the type, setting it up, or making the type or for other analogous steps. In the arrangements used for this purpose today, selecting devices are used in which a group of contactingv device co-'operates 101 With a set of selecting members which are controlled by the current impulses and controls the device for performing the desired final operation. The desired type is printed, set up, cast or otherwise acted upon in accordance with the setting 15,0f the selectingV devices relatively to the contacting devices.

High speed receivers introduce a diinculty in that the setting up of the type and the returning oi the set selecting members must take place 20 during the time in which new code current impulses are being received for the setting up of a further type, because otherwise, the line over which the current impulses are transmitted would not be fully utilized. In the known arrangements, special signal storing intermediate devices have to be provided for this purpose in the selecting device which, vowing to Atheir number and size, complicate the constructionrof the selecting .device and impair itscertainty of op- 3() eration. In order to be able to dispense with these special intermediate members and in order, in spite of this, to obtain a satisfactory full utilization of the line, it has already been proposed to use several receivers arranged for multiple operation over a line in such a way that `ceiver in dependence upon the signal code current impulses of al second message.

The object of the invention is to improve the construction ofthe selecting device of a receiver for signal code current impulses for selecting andV setting up, printing, making and performing the operation on type characters in order to make the operation of the receiver faster and more certain than has hitherto been possible.

According to the invention, two or more sets of selecting members areprovided so thatsuccessive sequences of current impulses corresponding to the various signals received are dealt with by a different setof selecting members. The se- `lecting members of each `of thesesets-are Vthus` 'displaced so as to become available for making the contacts necessary for carrying out the desired operation on the type. VOne or more members are provided for contacting with the displaced selecting members and the contacting member or members has contacts arranged so that there is one and only one position of the displaced set of selecting members relatively `to it or them in which the desired contact can be made. l

By means of this provision, a new type can be selected while a selected type is being set up, printed or otherwise treated and the set selecting members are being restored to their inoperative position. The time interval allowed for this purpose is substantially longer than in any known arrangement having a single receiver and can be used more satisfactorily, for example, for printing from a stationary typewheel and without 'any too complicated setting up measures.

The setting up steps, that is to say, the steps for printing, setting, casting or the like of the type must be completed in thetime taken by the current impulse transmission of a complete code signal. The return ofthe selecting members can be carried out at the same time or later. It is to be noted that the invention uses no special signal storing intermediate devices Whatever, but allows an overlapping of the time allowedl for the setting up and the time allowed for a further signal reception so thatthe current impulses of the new signal are used directly for setting the selecting device.

In order that the invention may be thoroughly understood and be more readily carried into eifect, an example of construction in accordance therewith will now be described with reference to the accompanying drawings, in which:-

Figuresrl to 6 show in tabulated `form and diagranunatically the data required for the construction of a selecting device having 'two adinstable units. s

Figure 6d shows diagrammatically a selecting Y device and a type wheel.

` Figure 7 shows a detail ofthe'type wheel shown in Figure 6a. i

Figure 8 shows the basic `construction of an arrhythmically operated tape printing telegraph receiver having a selecting device in accordance with the'invention. Y Y

`Figure 9 is a perspective diagrammatic view of a tape printer in accordance with Figure 8, and showing details of construction.

Figures 10 is a diagrammatic front View of al selecting device of the tape printer shown in Figure 9.

Figure 1 gives the international table of code signals of the Baudot type in which each signal consists of live units. The rst vertical column contains the numbers 1 to 32 and the second and third columns the letters of the alphabet and the corresponding figures and signs which are transmitted by like signals. The code signals opposite the numbers 27 to 32 are not used for the selection of a type but for carrying out special controlling steps of the receiver.

Thus, Wr indicates carriage return, ZL fresh Y line, and are only necessary with sheet printers.

Bu indicates change from numerals and signs of the third column to letters of the second column; Zz indicates change from letters of the second column to gures and signs of the third column; Ab space.

The following seven columns in Figure l indicate the sequence of current impulses for each signal. Each code sign consists of live current impulses. When operating arrhythmic receivers, each signal starts, however, with a start current impulse and ends with a stop current impulse. The absence of a dot in one of the seven squares indicates a current spacing impulse. Each start is, for example in closed circuit operation, characterized by a short interruption of the current which exists dueto a stop. As the start and stop are in no way typical of the ve units code, they may be to some extent neglected in what follows.

In Figure 2, the numbers 1-32 appearing in the iirst column of Figure 1 again occur but in a different sequence, the corresponding code signals again being set out in the next ve columns and ve adjustable selecting members I to V are shown above these ve columns.

If it is assumed that the table of Figure 2 represents a Baudot distributor such as that shown in British Specification No. 3096/ 1375, and

that the selecting members I to V are set at right angles to each other so that, for example only the members l and 3 are in operation, it will be clear that on movement of the distributor I. in the direction of the arrow, a so called key position, that is to say, a position in which a current circuit is set up by means of the selecting members for performing the desired operation on the type, is only obtained when the selec- -tor members I and III coincide with a horizontal row of squares in Figure 2 in whichY the corre-Y sponding dots occur only in the rst and third columns, that is to say, the row 19. 'I'he type to be printed is selected by the setting up of this key position. As can be seen from Figure 1, the code combination in row 19 corresponds to the letter S or the sign according to the setting of the machine.

The code combinations are arranged in Figure 2 so that the dots indicating current units lie along lines making an angle X with the horizontal. Baudet has already proposed (see British Patent No. 436/1882, Figures 13 onwards) to displace the vertical strips 1 to 5 of the table of Figure 2 so that the connecting lines between the points run horizontally and so that instead of the Wide combination strip, it is possible to obtain a strip somewhat like that shown in Figure 3.

With Baudots proposal, the displaced stripv must always be lengthened by the amount of its displacement so that the finally obtained single strip has a greater length than'the 32 spaces shown. The strip shown in Figure 3 is obtained if the five-column strip of Figure 2 is considered as the development of a helix, the pitch of which is equal to the pitch of the columns. In that case, the total length of the nally obtained strip is not altered. If the strip is wound round the circumference of a disc, the disc can be used for the selection of the type and, if need be, a type wheel can be rigidly connected to the'spindle of thedisc.

The displaceable selecting members I to V must now, of course, lie in the shown space parallel to thestrips in Figure 3 and, in order to select a type, have to be displaced horizontally relatively to each other. Then, however, a key position can only be obtained, if next to the strip c shown in Figure 3 which may be called a positive strip, a corresponding strip (not shown) is placed which has a reversed arrangement of current units, and which will be called a negative strip.

Now the strips can be imagined to be in relief, so that the squares provided with dots are depressed relatively to the remaining squares, and the selecting members can be further imagined as feeler levers with a common mounting, which are displaced horizontally relatively to each other according to the received code current impulses. If the negative strip lies to the right of the positive strip and the selector members I and V are again so displaced that the members I and III are displaced to the left by the width of two strips, when the two strips move together in the direction of the arrow, a key position will only be obtained when the selecting member I reaches the square opposite the numeral 19. It is only at this point that the engagement of the two selecting members I and III is possible and the letter S or the sign thus selected.

In order to have a larger number of groups of contacting members, the strip shown in Figure 3 may be divided into two like parts a and b as shown in that figure. A larger number of groups can be used if desired. These parts a and 'o are oppositely disposed relatively to each other, that is to say, as seen in Figure 4. The strip c remains as it was in Figure 8 and the strip d consists of the parts b at the top and the part a at the bottom.

In Figure 5, the strips are shown as side views of developments of cam discs, in which the dotted squares are replaced by upraised or depressed portions. The cam discs e and g correspond to the strips c and d shown in Figure 4. Next to each of the cam discs e and g, a further cam disc f or h is arranged which corresponds to the appropriate already mentioned negative strip.

rEach positive disc e or g forms, together with its negative disc f or h a pair of combination discs, that is to say, a group of contacting members. A plan view of the strips e--h of Figure 5 is shown on the left of Figure 6 in which the hatched parts indicate grooves.

When the strips are subdivided into portions a and b as described, there vare two sets of displaceable selecting members. The set A has selecting members I to V which cooperate with the combination discs e and f and the set B has selecting members I to V which co-operate with the combination discs y and h. These two sets of selecting members are spaced apart so as to co-operate with their associated pairs of combination discs at an interval of 130. The amount i (Figure 6) by which the selecting members can be displaced corresponds to the spacing of the discs e and f or g and h. The selecting members are displaced individually to the left when :isili current impulsesoof Corresponding typev occur during the lcourse of a sequence of current impulses. It a selecting member ofthe upper set A of` Figure 6 is set so that the members Iand III, as shown, can be moved-to the left bythe amount` while the remainingV members remain at rest, then, after a given angularrotation of the combination discs relatively to `the set of .selecting members A, the position shown in Fig ure 6 is reached, in which each of the members of the set of selecting members A isengaged in vadepression (hatched portion)4 in one or the discs e and f. rFrom the table givenin Figure` 1 and that at the right hand end of Figure 6, it is clear' that with the selecting members of-Vtheupper set A in the position shown,V the signal having the number 19 is thus selected, that is to say, the letter S or the sign Withthe combination discs inthe position shown, it is clear that on displacement ,of the selecting members I and III of the set B, vthe selecting members I' and V can engage in deI pressions in the circumference ofthe combination discs g and h. These discs are displaced 180 relatively to the discs c andf and reference to the tables shows that in this case the letter S` or the sign is again selected. Thus it is immaterial whether the selection iscarried out by the selecting members crthe set A or of the set B. 1

Even if it were possible without considerable trouble to operate individually pivoted levers or the like provided with types for the purpose of printing the selected signal in accordance with the setting of the `combination discs eV to h, it

issimpler for explainingtlie inventive idea oi"r this invention to consider the case oi a type` wheel rigidly connected to theYcombination discsV andv rotated with them. The position of such '1a.wheel would be controlled by the sets of selecting members A and B andtheir pairs oi com.

bination discs so that as indicated diagrammatically to the right of Figure 6, the selected type is printed at the fixed point Z. 4 i

As there are code combinations, the least distance between successivedepressions in-t-he circumference ofthe combination discs is equal` to g1g of their circumference. The circumfer-` ence lc of the type wheel is therefore sub-fdivided 'correspondingly so that all the types of one group of characters are `formed thereon in succession at intervals of of the circumference. However, as gures and signs also have jto be printed in addition to the letters, and these are prepared L for printing in the usual way by Vsmall angular displacements of the type wheel, the type wheel is divided into -64 parts.Y Thus, lthere are also sections on the type wheel which correspond to signals which are not for the .purpose of directly selecting types to be printed 'but for carrying out certain .switching steps ior preparing the ma-.

chine for a. particular mode of cperation.- The type wheel is shown diagrammatically at the right hand end of Figure G and the sections `just l referred to are heavily outlined'. In order to prevent printing .when the `typewheel is set to these special sections, devicesfknown inutilemselveshave to be provided. y

`As shown inFigure 6, the type wheel preferably is set relatively to the combination disc `that'the fixedA point l at which the printing takes place is displaced by from: bers A and B. j

Figure 6c shows diagrammatically and. inper- 'spective the essential `A`parts :of an'. arrangement the sets of selecting inem` members ofthe set B which co-operate with their' combination discs g, h are not displaced at the instant visualized. They could, however, be set by current impulses during the rotation of Athe combination discs, that is to say, during theinterval which extends from the setting of the selecting members of the set A to the conclusion of the printing of the letter S, due to the setting of the set of selecting members A, and, immediately after the return to the inoperative position of-'the selecting members A, be brought into operation for resetting the type wheel.

Figures 1 to 6 illustrate the conditions necessary 'for a selecting device gear with two type setting units. They can, however, be used as the basis for a selecting device with a large number of units, say, four or six.

The invention is particularly useful in that it allows signals of uniform length to be received relatively rapidly with a simple construction of receiver. This is due to the fact that all rapidly rotating parts and, in particular, the combina.- tion discs and the type wheel can be of small size and weight and small diameters and the remainder can be rotated slowly somewhat as in the parts moved in the start-stop system so as to reduce the acceleration forces. As the lower limit for the diameter of a type wheel is determined by the size of the type and theV arrangement of the type carrying members, a type wheel of the kind shown in Figure 7 is found most suitable. The types are formed on the face of heads lc resiliently connected to a hub 120 or of sectors cut out from a highly elastic type wheel disc. With such an arrangement a type head can be projected out from the type ring through the distance D by exerting a pressure in the direction of the arrow without having to displace the whole wheel or the whole printing installation at each printing step. If the sector shaped tongues m connecting the type heads to the hub of the type controlling the speed of rotation of the receiver.

The selecting devices of 4Figures 6 and 6a could be used for multiple as well as arrhythmically operated receivers, that is to say, for start-stop printers.

The essential features of construction of a strip with the invention-is shown in Figure 8. `A vuniversal motor M is used for driving the shaft 100,

its speed being maintainedpractically constant by a regulator whichis not shown in the drawings. `Themotor drives the shaft 100 through a worm gear G whichrotates in the direction of printing receiver working on the start-stop principle and having a selecting device in accordance the arrows. Toothed wheels 101 and 102 are keyed on the shaft 100 and drive the toothed wheels 103 and 104 continuously. Thetoothed wheel 103 is free to rotate on the shaft 105 and carries the toothed member 106 of a start-stop coupling. The other member of this coupling has a sleeve 107 which is displaceable along the shaft 105 and after each half revolution of the toothed wheel 103 can, by means of a projection 108 on .flo it and a projection 140 on an arm 138, be uncoupled against the action of a spring 109. When the sleeve 107 is coupled, the shaft 105 is driven by the wheel 103 at a speed determined by the gear ratio of the toothed wheels 101 and 103.

The sleeve 107 also drives a collar 112 on which there is an arm 113 with a horizontal projection 114. The arm 113 is thus rotated with the sleeve 107 at each half rotation. The collar 112 is axially movable relatively to the sleeve 107 and can be moved in this way by the armature 110 of the receiving electro-magnet 111.

The selecting members I to V of the set A and I to V of the set B which are fixed to the selecting device W are displaced relatively to each other by 180 and are set with their ends in the path of the projection 114. According to the setting of the projection 114, rotation of the latter causes some or all the selector members I to V or I to V to be set for selecting in comobination with the contacting i. e. combination discs e to h the signal to be printed. The combination discs are xed on the shaft 115 on which the toothed wheel 104 is loosely mounted. This toothed wheel 104 tends to drive the shaft 115 giconstantly by means of a friction coupling consisting of a friction member 116 which is arranged between the toothed wheel 104 and a disc 117 keyed to the shaft 115 and subjected to the pressure of the spring 118.

The type wheel 120 is also fixed to the shaft 115 so that it assumes the same angular position as the combination discs.

The printing position is arranged at the top of the type wheel. When a character is to be printied, a type head which is on an elastic tongue is struck against the tape P lying on the block 123 by means of the hammer 119 which is under the influence of the spring 122 which is adjustable by means of the thumbscrew 121. After the 'jprinting, the strip is moved on in the direction of the arrow to provide the necessary space by a device 124 known in itself.

The hammer 119 is controlled by the cam wheel 125 fixed to` the shaft 100 which has a number of notches 128 in its circumference. The printing hammer 119 is only released when a feeler lever pivotally mounted on the pivot 126 engages with its left hand end 127 in a notch 128. The time during which the feeeler lever 128 maintains the pressure depends upon the rate of rotation of the shaft 100 and the number of notches in the cam wheel 125.

The withdrawal of the hammer 119 is also controlled by the notches in the cam wheel 125; the vfaces 129 of the wheel 125 which is rotated in the direction of the arrow act on the feeler lever 127 in such a way that the printing hammer 119 is swung back about its pivot 130 and is latched at its lower end 131 by a pawl 133 pivotable about 3o the pivot 132. rIhe printing occurs at any time under the influence of this pawl after selection of the type to be printed.

The switching arrangement for bringing the receiver into action is also indicated in Figure 8. The winding' of the magnet 111 lies in a circuit which includes an earthed battery B, a transmitting contact Sk and the connecting line L which goes to earth in the transmitting device of another station. If a transmitter is connected to the illustrated receiver by means of the closed contact Sic, the signals sent by the transmitter will be printed.

Figure 9 shows a different View of a receiving arrangement for tape-printing corresponding to that shown in Figure 8, in which further devices are shown, in particular for setting the selecting device W which is merely indicated in Figure 8, as well as for the shifting from one group of characters to another on the type wheel, and so forth. The same reference letters are used for the same parts in Figures 8 and 9.

The coil 111 of the receiving electro-magnet of the tape printer of Figure 9 lies in a circuit which is normally closed. The circuit in this case is under the control of a transmitting contact Sk which is actuated in rapid sequence for sending a code signal on the Baudot system.

The armature of the electro-magnet is shown in the position taken up when the circuit is made for the stop sign, which consists of the attracted position. The extension 110 of the armature, as was earlier mentioned in the description of Figure 8, co-operates with the collar 112 and has a lateral extension 134 having an upturned end 135 which rests against the obliquely bent end 136 of a bell-crank lever 1360i which is under the influence of a tension spring 137. The lever 138 has a pivot 139 and its end 140 can thus rest the sleeve 107 above the projection 108.

The shaft 105 carries at its forward end a disc 141 which has a cam surface extending over half its circumference. On the circumference of this cam disc slide two oppositely disposed projections 142 and 143 from the members A and B carrying the sets of selecting members. These members A and B are mounted to pivot about the shafts 144 and 145 and are respectively under the influence of a spring 146 and a spring 146 which is not visible. The spring 146 is connected to the frame R which is mounted on the spindle 147 and which bears with its lever 148 against the member A. The frame R with its lever 149 is similarly mounted'with respect to the member B. In addition to the levers 148 or 149 the frames R and R" also have correction and check pawls 150 and 151 which when the appropriate frame is pivoted, engage in one of the 32 teeth of the toothed wheel 152 which is rigidly connected to the combination discs e to h and the shaft 115, and, after predetermining the rotary displacement of the shaft 115, determine the exact key position and the stopping of the thus connected type wheel 120 connected therewith.

Each of the frames R' and R" also has extentensions 153 and 154, the extensions 154 being mounted so as to be free to move in one direction on the extension 153. When one 'of the pawls 150 or 151 is in engagement with the toothed Wheel 152, all the extensions of the appropriate frame R or R move rigidly together.

Each of the extensions 154 lies on the arm 155 of a lever 157 pivotable about a pivot 156, the position of rest of which can be set by means of the screw 158. The lever is permanently under the'iniiuence of the spring 159. One end of the releasing pawl 133 for the hammer 119 which can be oscillated about a pivot 132 bears on the left hand end 160 of the lever 157 under the influence of the spring 161.

The angle of oscillation of the frames R' and 150 ,the iniluence of `its spring 161. later, however, the :end 166 of the feeler lever :head 167 for printing thejselected type. strong tension spring122 provides the `accelerating forcefor the hammer 119.

'v lever 169.

-R'iis;1argelenough so that when, for example, -the pawl 150 is put into operation, the extension 154 slides overa tooth 163 of the transverse bar 155 and as itmust move with the frame R in this direction, it .thus presses the right hand arm vof the lever 157 downwards. In Figure 9, the frame 'R' is shown in the operative position.

When the f-rameR is moved out-of the position shown, owing to the manner in which itis mounted `the extension 154 snaps, without sliding over the tooth 163, directly into-the rear position such yas, that shownloccupied by the extension 154 yof the frame R.

As the members 154 pass over the teeth 162 The upper end 164 of the hammer 126 andthe rear end 166 of which lies as shown opposite the teeth of the cam vwheel 125 which is rotated with the shaftvlOO lin the Vdirection of the arrow.

.. 'If, when the hammer '119 is released by the pawl 133, the cam'wheel 125 isexactly in a posi- `tion inwhich a tooth 128 lies in front of the .rend 166, then the hammer can only be` pivoted through the angle which is allowed by the 4elas- :ticity of the jmember 165. Ihis amount is large .enough for the lower` end 131 of the hammer to be unlatched when the pawl 133 returns under A short time 1127Hengages momentarily in a toothspace` 128 and thus the hammer 119 releases its printing The Immediately `after the printing step,lthe feelerlever 127 is again swung back because its end` 166 slidesalong 1a cam surface 129 and the hammer 119 is brought back into the latched position shown in the draw- `ings by means of thefront end 165 of the feeler lever. The tape P-is 4then advanced but as this is `eifected by generally known means, the latter 'have not been shown.

nf type characters on the type wheel 120. Acam ff disc 168 is connected to the shaft 115 which serves Vwhen the `type wheel is set to a Vsection which corresponds to a code signal which is merely for the purpose offshifting theapparatus Aand not for effecting aprinting step, to prevent ,any such printing and, if need'be, to allow the necessaryshiftingsteps to take place. If, for example, a signal for figure shift is received, the combination discs are displaced so that the cam disc 168 remains with its notch Ziopposite the This lever, which is Apivotable about the pivot 170 can 'engage inthe lnotch-under the .pull of the spring 171 `and lift its bent end `173 Iwhich extends vertically from the point 172. The rod 173 is thusbrought behind a bend 174 in the feeler `lever 127, `and prevents this Yfrom `engaging `in a space 128 of the cam wheel 125. Printing `is `thus prevented if the character signal (number 86) is received. In the same way, on receipt of `the signals Bu, WR, ZZ, 'Ah and so forth, `printing is preventedieach time through 'extensions 187 of the type wheel 120.

engagement of` the lever 169 inthe corresponding notch in the cam 168.

Two further discs 175 and 176 are also connected rigidly to the shaft 115. A pivoted lever 177 which is set at 90 to the lever 169 bears on the surface oi the disc 175 and, under the tension of its spring 178, tendslto engage in a-groove Zi in its circumference. This groove is only opposite the endy of the lever 177 when the character pivots about-its pivot 185 under the pressure of its relatively strong spring 184 so that its forward end 186 thus bears on a roughened cylindrical Further rotation of the type disc for setting the next signal to be printed is thus `made dimcult because it can only take place by overcoming the friction existing` between the end 186 and the drum 187. i

The type wheel 120 is not rigid with the shaft 115 but is torsionally and elastically connected by means of the spring 200. It can beset to a 1/64th part of its circumference relatively to the normal position determined by the spring 200. For-this purpose, itis mounted with clearance about the pin 201 and is held in the illustrated positionlby the spring 200 which engages in an opening in the projection 202 to thedrum 187. If, when the type wheel is moved in the direction of the arrow for the purpose of setting it, a braking force is set up by means of the lever 186 and thebraking drum 187,:the restoring force of the spring 28D is overcome and the type wheel `always `remains behind'its normal position by a ,printing the numerals and signs shown in the third column. Thus, when-thesignal Zi has been received, all subsequent code signals will be printed as numerals or special signs.

`The-disc 176 onftheshaft 115 also actuates forward end 189 of a lever 188 by means of a cam Bu if, on receipt of the signal Bu, the corresponding` notch in `thefdisc 168 is beneath the end of the lever 169. In this way, the lever 188 overcomes its return spring 190 andpivots-about the pivot 179 so that its projection 191 strikes the'double-armed releasing lever 192 and thus causes the l nose 186 Vof the braking -leverl`183 to be lifted `from the. drum 187. The lever 183 now snaps back below the pawl 181-andremains in the `position shown in Figure 9. Immediately after the removalof the braking lever 183, the

,spring 200 resets the type wheel in the normal position so that after receipt of the signal Bu `the code signals are again printed-as letters.

The levers 177 and 178 can only be causedvto pivot on receipt of the appropriate type character shift signals by setting the combination discs to the signals Zi or Bu. The lower arms of these .leversabut against the-arm-193of the lever 195 pivoted about the pivot 194. This lever 195 is 4under the-influence of the extension 153 of the frames R or R. When these frames are not in operation, the pull of the spring 197 acting on .the arm 1.96 of the lever 195 is large enough to overcome the forces exerted by the springs 178 and 190 on its other arm 193. On the other hand, the spring 146 on the frames R or R." is strong enough `so that when One of `these frames is the lR. is pivoted, through the rods 198 and 199 to the lever 195.

pivoted, it overcomes the action of the spring 197 and displaces the lever 195. When the frame its movement is transmitted In this way, apparatus shift steps are only allowed to occur on selection of a character switching signal and by releasing the levers 177 and 188.

'Upon receipt of any other signal, no operating measures whatever could vbe undertaken during Vthe'setting movement' of the combination discs lwith the discs 175 and 176 because, during this separation of their left hand'ends corresponds to the smallest spacing of successive depressions in the discs e to h indicated by hatched lines. The right hand ends are arranged over the circumference of a circle, the radius of which is the radius of the arm 113 measured to the projection 114. These conditions are clearly seen lin the front view given in Figure 10 in whic the angular amounts are indicated. f

In Figure 9 the set of selecting members A is set and, as a key position is obtained, is shown in the operative position. The left hand ends of the selector members I to V engaging in the depressions inthe appropriate contacting members e and f serve solely for testing the existence of the key position. The printing step follows this verication of the angular setting of the combination discs as a result of a pivotal movement of the frame R'. The shaft 115 is held in this particular angular position by the engagement of 'the correction pawl 150 in the teeth of the wheel The devices for returning the selecting members I to V and I to V once they have been set after selection of the type characters corresponding to the signals are not shown. It is preferable to carry out this return setting by releasing a force stored in springs during the setting so that the set of selecting members A is lifted out of the depressions in the contacting discs again by the cam shaft 141.

Above all, in the construction of the example described in Figure 9, it should be possible to use spring forces, especially where small setting forces are required. This is mainly so in the case of the parts set by the receiving magnet 111, such as the start-stop coupling and the selecting members. The re-tensioning of the springs is then effected by the driving motor, for example, 'lthrough the medium of the cam shaft 141 or the ike.

The steps in the printing of a type character by means of the telegraph printing receiver of Figure 9 will now be described.

The receiver responds to rapid closed circuit telegraph signals of the Baudot type. The usual maximum receiving speed is seven signals per second so that in the manner described earlier on, each signal consists of seven current impulses if arrhythmic operation such as start-stop operation is used.

For the purpose of receiving signals in a startstop receiver of the known type, for example, of the Morkrum-Kleinschmidt and Creed types, it is necessary to rotate the setting receiving shaft for selectively influencing the selector members leasing steps can take place in the receiver.

about 8% faster than the distributor shaft of the corresponding transmitter and to rotate the shaft of the type wheel about 40% faster than the setting shaft of the receiver. The device described in Figure 9 comprises two selecting sets in which the working positions for setting these sets lie on the circular path of the setting arm 113. The arm 113, however, only rotates about 8% faster than half the speed of the distributor shaft V of the transmitter Sk. With a normal speed of rotation of the distributor of the transmitter of 6.48 revolutions per second, as the receiver runs 8% faster than the transmitter, 6.48 signals could be dealt with per second in the known receivers with a distributor speed of 7 revolutions per second. The receiver shown in Figure 9 also deals with 6.48 signals per second but with a distributor speed of only 3.5 revolutions per second. The preferred construction of the described receiver provides on the other hand for operation with a type wheel speed which is only about 18 to 20% faster in spitey of which all the 6.48 signals per second have to be printed.

The seven current units which occur for each signal during a half rotation of the arm 113 operate for example in the sequence shown in Figure 10 on the left hand set of selecting members A. The rest position of the setting arm 113 shown dotted is, on receipt of a signal, the starting position for the rotation taking place in the direction of the arrow. In the rst seventh part of the signal, a rio-current unit occurs so that re- At the middle of each of the ve following current units, each of the Vselecting members I to V is set in its operative position in front of the pin 114 on the arm 113.

The selector members of theset A are shown in Figures 9 and 10 in their operative position which they have assumed owing to a previously received signal. This code signal corresponds to the letter S, number 19, so that the members I to III lie in depressions in their positive disc e and the remainder in the depressions in their negative disc f. In the interval in which the setting arm 113 is removed from the position shown dotted in Figure 10, they are, however, returned together, for example, through the releasing of a spring force preferably during the following start current unit, into the rest position which is shown for the selector members of the set B on the right.

Suppose the distributor shaft V of the transmitter Sk is caused to rotate for one revolution for the purpose of sending the letter S and printing it in the receiver. As is indicated in Figure 9, owing to the construction of the cam disc of the transmitter, contacts in the transmitter are operated for a short time at 1, 3, 5 and 6 sevenths of a revolution and at the corresponding instants the magnetic armature 110 in the receiver is released.

The first relapse of the armature on sending the start current unit results in the following operative steps.

The bent-up portion 135 of the extension 134 of the armature 110 slides lengthwise on the bent down portion 136 of the release lever 138 and lifts its controlling end 140 against the pull of the spring clear of the projection 108.

The member A is at this instant pivoted about its pivot 145 by the cam disc 141 against the action of its spring 146 to such an extent that the selecting members I to V are lifted out of the depressions in the combination discs e and f and neath the selecting members.

stant, the correction pawl 150 engages in the are returned to their position of rest. The shaft of the type wheel and of the combination discs is locked against rotation, however, through the `engagernent vof the selector members I `to V of .7 the member B which are set by the previous receipt of a signal and by the engagement ofthe appropriatecorrection pawl 151.

immediately after receipt of the fifth selecting current impulse, that is to say, the sixth current step, the member B is also lifted by means of the further rotation of the cam disc 141 so that for a short time, neither the member A nor the member B can engage and the shaft 115 is driven by the friction coupling 116, 117. The set selecting members of the member B Vthus return to vtheir position of rest.

Further, before the shaft is stopped by the receipt of the seventh current unit, that is to say, the stopcurrent unit, the cam disc 141 makes the member A free to contact. The selector members 1 to V set in accordance with the re ceived code signal, slide on the circumference ofthe contacting members e and f untilthe key position corresponding to the signal comes be- At the same intoothed wheel 158 and locks the type wheel 115 against further rotation.

i The interval of time during which the two members A and B `are lifted by the cam disc 141 can be made so small that no rotation of the type wheel takes piace during this interval. If, for example, the type wheel was set to the letter S by the previously received signal and, as assumed, the selecting members I to V are again set in .accordance with this signal, then these selectingmembers and the correction pawl 151 immediately engage Without the `type wheel first making a revolution. For the sake of safety, however, as is indicated in Figure 9, the time interval for the lifting of the two members A and B is made so large that the type wheel shaft always starts.

. As soon as the member A is released by the cam disc 141, the armature 110 is permanently attracted by the receipt of the stop current unit so that the end 135 of the projection 134 of the4 armature lies in the angle 136 of the control lever 138. The other end 140 of this control lever thus comes Within the range ofmovernent of a projection on the sleeve 107 which is 180 apart from the projection 108 and is thus not visible in the drawings. The coupling sleeve 107 then snaps to the right under the action of the spring 109 and couples the shaft 105 and the part 106 and the toothed wheel 103. The shaft 105 begins to rotate and the collar`112 also rotatesin the direction of the arrow together with its arm 113. The collar 112 is directly controlled by the armature 110 and according to Whether the magnet 111 is ener-` gized or not, the parts 112 and 113 are moved to the right or left in the setting movement which now takes place. During the start section, the arm 113 moves to the left and only moves to the right at the second and fourth current units, disregarding the stop unit.

During the pivotal movement ofthe frame R when the key position for the letter S is obtained, the extension 154 whichV is moved with the frame R during this swinging movement, slides over the tooth 163 of the transverse bar 155 and thus momentarily swings the lever 157 about its pivot 156. The end 160 of the lever is thus. lifted, overcoming the return force of the springs 159 and 161. and

the paw-1133 is pivoted and the hammer 119'` released.

' At the same time, the extension 153 of the frame lR by overcoming the force of the spring 197, pivots the lever 195 and thus releases the pair of 3,80 levers 177 and 188 so that under the iniiuence of their springs 178 or 190, these levers come into contact with their appropriate cani discs 175 and 176. On receipt of the signal S, these levers are not opposite a notch so that a shifting step cannot take place. Further, in this key position of the combination discs the lever 169 does not engage with any notch in the cam disc 168 so that the bar 173 remains in the illustrated lower inoperative position.

The cam wheel 125 is rotated by the shaft 100 which also drives the wheel 103 forvsetting the selecting device through the wheel 101 and the wheel 104 for driving the shaft 115 through the wheel102. The wheel 125 has such a number of saw-shaped teeth which determine the instant of time and the interval of time for the printing of a type. When the end 166 of the lever 127 engages in a notch 128 of the cam wheel 125, the hammer 167 strikes the selected type of the type Wheel under the influence of its spring 122 and effects the printing. Thehammer is then returned to its inoperative position, lifted by means of the lever 127 and the part 129 of the following teeth of the cam wheel.

These described steps for making the member A by means of the cam disc lfilfree to engage until the `hammer 119 is returned `to the inoperative position could be carried out `while a new code signal is` being received and the selector mem- 110 bers I to V of the set B are being set. It is only necessary for the steps to be completed when, at the beginning of the stop unit of the new signal, the member A is liftedby means of the cam disc 141 and the shaft 115 of the type wheel 115 is made free to rotate. If it is assumed that the signals are to be given in direct succession at the highest speed of 6.48 signals per second, then the time available for each signal is 0.154 seconds less a period of about 0.007 seconds, during which both 1270 frames R and R are lifted. A maximum period of 0.027 seconds is necessary for setting the hammer 119 into operation, because of the coupling with the continuously rotating cam wheel so that 0.120 seconds are required for a single rotation of the type wheel shaft 115 for setting the key position for the received signal. This means that the type wheel shaft 115 must rotate at about 8.4 revolutions per second, that is to say, about 20% faster than the normal receiver distributor in which there is no second set of selecting members.

From the explanation of the manner of operation of the receiver shown in Figure 9, it is clear what special advantages are possessed by a type printing telegraph receiver having several selecting devices. The members actuated on the startstop system can be made lighter and owing to the lower speed of operation are more easily operated and more certain in operation. The vibrations to which the apparatus is subjected on stopping the masses and the forces set free for the acceleration of the masses are thus relatively small. This also applies to the shaft 115 which is rotated at a substantially lower speed than is usual, 145 The light type wheel and the combination discs which are preferably made of duralumin are, because of their small moment of inertia, much more certain in operation. The wear and tear of all parts is considerably decreased owing to the 150 low speed of operation and thus the life of such receivers is increased. f

The use of separate groups of pairs of contacting combination discs in combination with separate sets of selecting members to form type selecting units working independently of each other makes it possible to arrange the control cams for the sets of selecting members separately from the combination discs and thus to obtain control discs of small diameter. If these control cams 141 are made separate from the type wheel 115 and are mounted on the slowly rotating shaft 105 of the receiving distributor, a further reduction in the moment of inertia of the type Wheel shaft is obtained.

We claim:-

1. An apparatus for forming setting-up or printing type characters, comprising a selector device for determining a type corresponding to received code current impulses of the Baudot type comprising a type preparing device, at least one group of contacting devices adapted to control the type preparing device, a plurality of sets of selecting members, a rotary setting member and a magnet adapted to be influenced by the code current impulses and to control said setting member, said selecting members being adapted to be set by said setting member and the selecting members of all said sets of selecting members being disposed one after the other in the path of movement of said setting member.

2. An apparatus for forming setting-up or printing type characters, comprising a selector device for determining a type corresponding to received code current impulses of the YBaudot type comprising a type preparing device, at least one pair of combination discs, a plurality of sets of selecting members, av rotary setting memberV l being arranged one after the other in the path of movement of said setting member.

3. An apparatus for forming setting-up or printing type characters, comprising a selector device for determining a type corresponding to *A received code current impulses of the Baudot '50' type comprising a type preparing device, a rotary shaft, at least one pair of combination discs rigidly connected to said rotary shaft, a plurality of sets of selecting members, a rotary setting member and a magnet adapted to control said setting member under the inuence of code current impulses, said selecting members being adapted to be set by said setting member and the selecting members of all said sets of selecting members being arranged one after the other in the path of movement of said setting member.

4. An apparatus for forming setting-up or printing type characters according to claim 2, in which the circumference of each of said combination discs is formed with cams and notches corresponding to the current impulses and solely in accordance with the number of the possible combinations of current impulses and cams.

5. An apparatus for forming setting-up or printing type characters according to claim 2, in which the circumference of each of said cornbination discs is formed with cams and depressions corresponding to the current impulses and solely in accordance with the number of possible combinations of current impulses, said cams and depressions forming combinations occurring only once in the circumference of each combination disc. Y Y

6. An apparatus for forming setting-up or printing type characters, comprising a selector device for determining a type corresponding to received'code current impulses of the Baudot type comprising a type preparing device, a rotary shaft, two` pairs of combination discs rigidly connected to said shaft, the circumference of each of said combination discs being formed with cams and notches corresponding to the current impulses, said cams and notches of one pair of combination discs being displaced by 180 to the corresponding cams and notches of the second pair of combination discs, two sets of selecting members, a rotary setting member, said sets of selecting members being set 180 apart in the path of movement of said setting member and a magnet adapted to control said setting member in accordance with the code current impulses.

7. An apparatus for forming setting-up o1 printing type characters, comprising a selector device for determining a type corresponding to code current impulses of the Baudot type, comprising a type preparing device, a rotary shaft, two pairs of combination discs rigidly connected to said rotary shaft, the circumference of each of said combination discs being formed with cams and notches corresponding to the current impulses, said cams and notches of one pair of combination discs being displaced by 180 to the corresponding cams and notches of the second pair of combination discs, two sets of selecting members, a rotary setting member, said sets of selecting members being set 180 apart in the path of movement of said setting member, a cam shaft for controlling said sets of selecting members connected to said rotary setting member anda magnet adapted to control said setting member in accordance with the code current impulses.

8. An apparatus for forming setting-up or printing type characters, comprising a selector device for determining a type corresponding to received' code current impulses of the Baudot type comprising a type preparing device, a rotary shaft, two pairs of combination discs rigidly connected to said rotaryshaft, the circumference of each of said combination discs being formed with cams and notches corresponding to the current impulses, said cams and notches of one pair of combination discs being displaced by 180 to the corresponding cams and notches of the second pair of combination discs, two sets of selecting members, arotary setting member, said sets of selector members being set 180 apart in the path of movement of saidl setting member, a cam shaft for controlling said sets of selecting members connectedto said rotary setting member and adapted to release at any time only one of said sets of selecting members for co-operation with one of said pairs of combination discs and a magnet adapted to control said setting member in accordance with the code current impulses.

9. An apparatus for forming setting-up or printing type characters, comprising a selector device for determining a type corresponding to code current impulses of the Baudot type cornprising a type preparing device, a rotary shaft, two pairs of combination discs, rigidly connected to said rotary shaft, the circumference of each of said combination discs being formed with cams and notches corresponding to the current impulses, said cams and notches of one pair of combination discs being displaced by1180 to the corresponding cams and notches of the second pair of combination discs, two sets of selecting members, a rotary setting member, said sets of selecting members being set 180 apart in the path of movement of said setting member, a cam disc for controlling said sets of selecting members, connectedto said rotary setting member and adapted at any time to release only one of said sets of selecting members for co-operation with one of said pairs of combination discs anda mag# received code current impulses of the Baudot type, comprising a type preparing device, a rotary shaft, two pairs of combination discs, rigidly connected to said rotary shaft, the circumference of each of said combination discs being formed with cams and notches corresponding to the current impulses, said cams and notches of one pair of combination discs being displaced by 180 to the corresponding cams and notches of the other pair of combination discs, two pivotable carrying members, two sets of selecting members one set mounted on each of said jaws, a rotaryT setting member, said sets of selecting members being successively `disposed in the path of movement of said setting member, a cam disc adapted to control said carrying members, said cam disc being connected to said rotary setting member and a magnetadapted to control said setting member inl accordance with the code current impulses.

11. An apparatus for forming setting-up or printing type characters, comprising a selector ``devicefor determining a type corresponding'to receivedcode current impulses of the Baudot type comprising a type preparing device, a rotary shafttwo pairs of combination discs rigidly connected to said rotary shaft, the circumference of each of said combination discs being formed with cams and notchescorresponding to the current impulses, said cams and notches of one pair of combination discs being displaced by 180 to the ""1nembers being arranged successively in the path i corresponding cams and notches of the other """pair of combination discs, two pivotable carrying members, two springs, one acting on each of said jaws, two sets of selecting members one movably mounted on each of said carrying members, a rotary setting member, said sets of selecting of movement of said setting member, a cam disc adapted to control said carrying members, said cam disc being connected to said rotary setting member and a magnet adapted to control said setting member in accordance with the code current impulses.

12. An apparatus for forming setting-up or printing type characters comprising a selector V. -device for determining a type corresponding to received code current impulses of the Baudot type, comprising a type preparing device, a rotary shaft, two pairs of combination discs connected to said type preparing device and to said rotary shaft, a correction wheel connected to said shaft, tw pivotable carrying members, two springs one acting on each of said carrying members, two sets of selecting members one mounted on each of said carrying members, two pawls one connected to each of said carrying members, a rotary setting member for setting said selecting members, said sets of selector members being positioned at i8@D apart in the path of movement of said setting member, a cam disc adapted to control said carrying members and connected to said rotary selecting member and adapted at any time to release only one of said carrying members and its selecting members, said correction wheel making possible the engagement of said pawl of one ci eaidcarrying members in any key position of one of said pairs of combination discs anda magnet adapted to control said setting member in accordance with the code current impulses.

i3. nn apparatus for printing type characters, comprising a type wheel, a printing device, a rotary shaft, a plurality of pairs of combination discs connected to the type wheel and to said rotary shaft, a plurality of sets of displaceable selectinggrnembers, a plurality of carrying members, each of said members carrying one of said sets of selecting members, springs acting on said carrying members, a rotary setting member for controlling said selecting members, said selecting members Vbeing arranged successively in the path of movement of said setting member, a cam disc adapted to control said carrying members connected to said rotary member, a magnet adapted to control said ,setting member in accordance with code current impulses and means for controlling said printing device, which means are controlled by said carrying members on engagement of said selecting members of one of said carrying members with a pair of said combinaticn discs.

14. Apparatus for printing type characters, comprising a type disc with types on its outer circumference and having radial slits between the various types, a printing device, a rotary shaft, a plurality of pairs of combination discs connected to said type disc and to said rotary shaft, a plurality of sets of displaceable selecting members, a plurality of pivotable carrying members, each of said members carrying one of said sets of electing members, springs acting on said carrying members, a rotary setting member for controlling said selecting members, said selecting members being arranged successively in the path of movement ci said setting member, a cam disc for controlling said carrying members connected to said rotary setting member, a magnet for controlling said setting member in accordance with code current impulses and means for controlling said printing device, which means are controlled by said pivotable carrying members on engagement of said selecting members of one of said carrying members with a pair of said combination discs.

l5. An apparatus for printing type characters, comprising a type disc with types on its outer circumference and having radial slits between the various types, a printing device, a rotary shaft, a plurality of pairs of combination discs connected to said type disc and to said rotary shaft, a cam disc connected to said rotary shaft, means controlled by said cam disc, for preventing the actuation of the printing device, a plurality of sets of displaceable selecting members, a plurality of pivotable carrying members each carrying one of said sets of selecting memvice controlled by said cam disc, a plurality of bers, springs acting on said carrying members, a rotary setting member for controlling said selecting members, said selecting members being arranged successively in the path of movement of said setting member, a cam disc for controlling said carrying members connected to said rotary setting member, a magnet for controlling said setting member in accordance with code current impulses and means for controlling said printing device, controlled by said pivotable carrying members on engagement of said selecting members of one of said carrying members with a pair of said combination discs.

16. An apparatus for printing type characters, comprising a type disc with types on the outer circumference and having radial slits between the individual types, a rotary shaft, means for torsionally and elastically connecting said type disc to said rotary shaft, means for rotating said type disc relatively to said rotary shaft by the amount of the pitch of said types on said type disc, a printing device, a plurality of pairs of combination discs connected to said rotary shaft, a cam disc connected to said rotary shaft, means for preventing the actuation of said printing desets of displaceable selecting members a plurality of carrying members each carrying one of said sets of selecting members, springs acting on said carrying members, a rotary setting member for controlling said selecting members, said selecting members being arranged successively in the path of movement of said setting member, a cam disc for controlling said carrying members connected to said rotary setting member, a

magnet' for controlling said setting member in accordance With code current impulses and means for controlling said printing device, which means is controlled by said pivotable carrying members on engagement of said selector members of one of said carrying members With a pair of said combination discs.

17. An apparatus for printing type characters, comprising a type disc With types on the outer rim of the disc and having radial slits between the individual types, the number of radial slits being twice as great as the number of possible combinations of current impulses, a rotary shaft, means for torsionally and elastically connecting vsaid type disc to said rotary shaft, means for rotating said type disc relatively to said shaft through the angle included between two neighbouring radial slits, a plurality of pairs of combination discs connected to said shaft, a correction wheel connected to said shaft, a plurality of paWls, a driving device, a coupling device for connecting said shaft to a driving device, a printing device, means for actuating said printing device after bringing said type disc to rest controlled by said driving device, a cam disc connected to said rotary shaft, means controlled by said cam disc, for preventing actuation of said printing device in certain positions of said type disc, a plurality of sets of selecting members, each of said sets of selecting members being adapted to co-operate with a pair of said combination discs, springs acting on said sets of selecting members and urging them to press against said combination discs, each set of selecting members being connected to a device for controlling said means for actuating said printing device on engagement of said pawls in said correction wheel, a further rotary shaft, a rotary setting member connected to said further rotary shaft, for controlling said selecting members, a cam disc connected to said shaft of said setting member for controlling said sets of selecting members against the influence of said springs, a coupling device for connecting said shaft of said setting member to said driving device, means for controlling said coupling device for the time of a partial rotation of said setting member, a magnet for controlling said setting member and for actuating said means for controlling said coupling device.

18. An apparatus for printing type characters according to claim 17, comprising a current impulse transmitter, a distributor shaft and means for driving said shaft of said setting member on actuation of said coupling device at a speed about 8% higher than the speed of rotation of said distributor shaft, divided by the number of said sets of selecting members.

19. An apparatus for printing type characters according to claim 17, comprising a current impulse transmitter, a distributor shaft, means for driving said shaft of said setting device on actuation of said coupling device at a speed approximately 8% higher than the speed of rotation of said distributor shaft of a current impulse transmitter divided by the number of said sets of selecting devices and means for driving said shaft of said type disc on actuation of said coupling device at a speed approximately 18 to 20% higher than the speed of rotation of said distributor shaft.

MAX AMANN. ALFRED LAHL. 

